如何将一个string类型的字符串转化成URL类型呀~~~

Question

我想把filename里面的地址转化成URL的类型
这是我的部分代码，不知道错在那里了
或者还有什么别的方法可以实现吗？谢了先！
    FileDialog op = new FileDialog(this,"插入",FileDialog.LOAD);
    op.setVisible(true);
    String filename = op.getDirectory()+op.getFile();//要转化的字符串 
    System.out.println("filename="+filename); //输出结果为E:\My Pictures\11.jpg
    
    URL url=null;
    try{
         url = new URL("file",null,filename);// String转化成URL
    }
    catch(Exception e){
    
    System.out.println("e="+e); 
    }
    System.out.println("url="+url); //输出结果是file:E:\My Pictures\11.jpg
    ImageIcon bicon = new ImageIcon(url);  //到这句就出错了         
    DrawObject drawObject = new DrawIcon(bicon, 100, 100,1); 

Answer 1

URL url = new File("E:\\My Pictures\\11.jpg").toURL();

Answer 2

to gtlang78():
   我试过了还是不行呀
   File f=new File("E:\\My Pictures\\11.jpg")这句可以执行，
   输出的地址为f=E:\My Pictures\11.jpg
   但是URL url = f.toURL();就出现下面的错误了
   怎么回事呢Exception in thread "AWT-EventQueue-5" java.security.AccessControlException: access denied (java.io.FilePermission E:\My Pictures\11.jpg read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.File.isDirectory(Unknown Source)
at java.io.File.toURL(Unknown Source)
at draw.PrintDoc.backDocument(PrintDoc.java:548)
at draw.Draw$MainFrame.commandBack(Draw.java:645)
at draw.Draw$MainFrame$5.actionPerformed(Draw.java:196)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 3

你的程序是不是个Applet呀，如果是的话是不能直接反问本地文件的。要加载一个图标的话可以这样
ImageIcon icon = new ImageIcon(YourApplet.class.getResource("iconfilename.jpg"));
打包的时候把图标文件和YourApplet类放在一起。